Re: Stock Mustang boss 427 vs. Challenger Hemi.... what u think? But still, the CAMMER owns all. Hands down. It had over 200 hp more (officially) than the HEMI. 425 as opposed to 657. I know the HEMI was underrated, but not nearly enough to be able to compete with the CAMMER. The CAMMER was Ford's response to the HEMIs. Ford clearly won. If the CAMMER had been street-legal, Ford would've won the battle on the dragstrip too.